A process that produces bearing housings is controlled with a fraction nonconforming control chart, using sample size n= 100 and a center line p = 0.02.
(a) Find the three-sigma limits for this chart.
(b) Analyze the ten new samples (n = 100) shown in Table 7E.11 for statistical control. What conclusions can you draw about the process now?

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TABLE 7E.11 Data for Exercise 7.43, part (b) Number Sample Number Number Nonconforming Number Nonconforming Sample 6 8 4 10